| 摘要 |
PURPOSE:To obtain the titled polymer with significantly low turbidity, by polymerization between a dicarboxylic acid component such as terephthalic acid and glycol component such as 1,4-butanediol in the presence of a specific titanic ester and alkanolamine. CONSTITUTION:The objective polymer can be obtained by reaction, that is, esterification followed by polycondensation between (A) a dicarboxylic acid component consisting mainly of terephthalic acid and (B) a glycol component consisting chiefly of 1,4-butanediol in the presence of (1) a titanic ester of formula I [R1 and R2 are each 1-10C aliphatic, alicyclic or aromatic hydrocarbon, n is 1-3 (including decimals)] (e.g., tetra-n-butyl titanate) and (2) an alkanolamine of formula II [L1, L2 and L3 are each H, alkyl, allyl or of formula XOH (X is 1-6C alkyl)] (e.g., diethanolamine).
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